rtc: ac100: Assign .num before accessing .hws

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98848
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:39 UTC
Updated2026-10-19 10:19:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: rtc: ac100: Assign .num before accessing .hws Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") annotated the hws member of 'struct clk_hw_onecell_data' with __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS) about the number of elements in .hws[], so that it can warn when .hws[] is accessed out of bounds. As noted in that change, the __counted_by member must be initialized with the number of elements before the first array access happens, otherwise there will be a warning from each access prior to the initialization because the number of elements is zero. This occurs in ac100_rtc_register_clks() due to .num being assigned only after every clkout clock has been stored in .hws[]. With CONFIG_UBSAN_BOUNDS and a compiler that implements __counted_by (GCC 15.1+ or Clang 20.1+), this triggers an array-index-out-of-bounds report during probe, and with CONFIG_UBSAN_TRAP the first store traps. Initialize .num with AC100_CLKOUT_NUM, the number of elements .hws[] was allocated with, right after the allocation. That is the value the loop counter ends up at on the success path anyway, so the provider's behaviour is unchanged.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f316cdff8d677db9ad9c90acb44c4cd535b0ee27 6bb55381daf1a1bed0657189a1396e7467712525 git Not specified
CNA Linux Linux affected f316cdff8d677db9ad9c90acb44c4cd535b0ee27 160619b38707241e22569f9c983a4b3d0890996a git Not specified
CNA Linux Linux affected f316cdff8d677db9ad9c90acb44c4cd535b0ee27 ad1bf77039cba83373bf1eff3784655e3e3ed2ab git Not specified
CNA Linux Linux affected f316cdff8d677db9ad9c90acb44c4cd535b0ee27 6a4117eee82dd85f11bf898bf66026764011eeb6 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6a4117eee82dd85f11bf898bf66026764011eeb6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/160619b38707241e22569f9c983a4b3d0890996a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad1bf77039cba83373bf1eff3784655e3e3ed2ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6bb55381daf1a1bed0657189a1396e7467712525 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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